I don't think this bull market is ready to give up the ghost just yet. But I'm reasonably sure that the volatility we're seeing now is like all those tiny little temblors that come long before the Big One.
Not that I think there will necessarily be a Big One ala '87 or '08. But capitalist economies have always been cursed with the rise and fall of the normal business cycle.
The biggest problem I see right now is liquidity. You have the fed unloading assets like Robin Hood throwing coins from horseback. And they've given no indication that they plan to stop. 3-4 trillion in assets can drain a f*ckload of liquidity, even if it happens over 10 or 20 years.
At the same time, you have one of the biggest federal giveaways in modern memory. That means that at the same time the fed is dumping paper into the bond market, you have a morbidly obese Uncle Sam making himself comfortable at the all you can eat treasury paper cafe. So there goes more liquidity.
That means that no matter what the fed does or doesn't do with interest rates, those puppies are going up - one way or another.